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Dynamic contour tonometry vs. non-contact tonometry and their relation with corneal thickness.pdf
Optik 127 (2016) 3912–3917
Contents lists available at ScienceDirect
Optik
journal homepage: www.elsevier.de/ijleo
Dynamic contour tonometry vs. non-contact tonometry and their relation with corneal thickness
Adriana Bricen? o, David Mas, Begon? a Doménech ?
Departamento de óptica, Farmacología y Anatomía, Universidad de Alicante, San Vicente del Raspeig, Alicante, Spain
article info
Article history: Received 8 September 2015 Accepted 4 January 2016
Keywords: Intraocular pressure Corneal thickness Dynamic contour tonometry Non-contact tonometry Tonometry correction factors
abstract
The purpose of this study is to evaluate the concordance between intraocular pressure (IOP) values obtained with a dynamic contour tonometer (DCT) and a non-contact tonometer (NCT) in healthy patients and to investigate the effect of central corneal thickness (CCT) on IOP readings for each of the two measuring systems. The mean IOP yielded by DCT, NCT and corrected non-contact tonometer (CNCT) was 17.1 mmHg, 15.5 mmHg and 12.2 mmHg, respectively. The average CCT was 563.6 ?m and the ocular pulse amplitude (OPA) was 2.8 mmHg. There was a moderate correlation between CCT and CNCT (r = 0.34, p = 0.001), a weak correlation between CCT and DCT (r = 0.03, p = 0.788) and a weak-to-moderate correlation between CCT and NCT (r = 0.27, p = 0.11). The intra-class correlation coef?cient (ICC) was 0.59 for the DCT-vs.-NCT comparison and 0.56 for DCT-vs.-CNCT. The mean difference between the two instruments (DCT/NCT) ranged from 1.62 to 4.47 mmHg. We have shown that non-contact tonometer is signi?cantly more affected by the central corneal thickness than the dynamic contour tonometer and therefore these methods are not interchangeable.
? 2016 Elsevier GmbH. All rights reserved.
1. Introduction
Biomechanical properties of the eye are of fundamental importance for proper model design, planning of surgical intervention, pharmacological interaction or even risk control of ocular pathologies. Among these pro
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